Hello, Welcome to healthcare magic, Most of the people will acquire more pigmentation as age increases, we call it facultative pigmentation. Lot of factors determine it, most important being sunlight, others include dust, pollution, smoking, less hydration, intrinsic ageing and free radical damage, stress etc. Disease like hypothyroidism can cause pigmentation and you should take treatment for it and keep it in check. Treatments should be to bring your pigmented skin back to your normal skin tone and make the skin tone even all over the face. I would recommend you to use a face wash twice a day ideally a one containing glycolic acid as it helps in exfoliation and to even out the skin tone.(eg : Melawash face wash) The most important product will be a sunscreen. Half an hour before going out apply a sunscreen ( eg: Neutrogena Ultrasheer Dry touch sunblock) and reapply it every three to four hours. You may apply a compact powder over the sunscreen so that there is a matte finish. At night you may apply a lightening cream containing kojic acid ( eg: Kojivit gel) over the face before going to sleep. You may consult a dermatologist practicing cosmetology for few sittings of chemical peels for faster improvement. Have a diet with colored fruits and vegetables as these are rich in anti oxidants. Papaya is good. Try to have it 2-3 times per week. Avoid fried foods, foods with a high sugar content ( high glycemic index) and avoid too much milk and milk products ( ice creams and chocolates). Drink 2-3 liters of water per day. Fresh fruit juices also help. Hope this helped, Take care.